Grid Interconnection — VAR Compliance

Reactive Requirements Study

Grid VAR compliance for any grid-connected generator. P-Q de-rating, study cases, gap analysis, night-time VAR assessment.

Applicable to any grid-connected generator — wind, BESS, thermal, solar. Note: inverter P-Q de-rating for temperature/elevation and night-time VAR dispatch are solar-specific but the study framework is universal.

Project Parameters

Project MW Capacity at POI

POI Definition

Target Power Factor at POI

lagging

FERC Order 827 requires ≥ 0.95 lagging

Inverter Fleet

Inverter Rated kVA (per unit)

Number of Inverters (PCS units)

Total fleet capacity: fleet_MVA = n × derated_kVA

De-rating Parameters

Ambient Temperature

°C

Site Elevation

PCS Maximum Design Temperature (Exhibit A basis)

Elevation De-rating (% per 100m)

Temperature De-rating (°C per 100% loss)

Manufacturer curve (default 0.5% per 100m)

Advanced

Transformer Impedance (Xf%)

Transformer Rating

MVA

Typical 10–14%

Apply IEEE C57.12.00 §9.2 +10% tolerance

Yes No

Manufacturing tolerance on nameplate impedance

AC Collection Losses

% of MW

AC Collection Losses (kW)

Study Cases

Night-time VAR Capability

Yes — inverters can dispatch at night No — not specified

Enter project parameters and run the reactive requirements study.